skip to Main Content

About Us

This mother & son team have been working and training together for over 20 years!
‘Assertive K-9 Training’ is now known as ‘California Dog Training’ and is under new management by the founders son, Robert Eimer. Same great training! Same location & facility. 951-277-0110 / 951-277-4040

The founder, Diana Foster-Voorhies has relocated to Las Vegas and is still training and breeding the finest German Shepherds. You can find her under ‘Las Vegas K-9 Academy’.  951-218-0566

2014-10-15 18.59.30 copy 3

Diana is still actively breeding her superior German Shepherds-known for their stable & calm temperaments. She also trains them before you get them.

Assertive K-9 Training / California Dog Training

Mission Statement

To patiently guide dog owners and educate them on how to handle, train, and establish an appropriate relationship with their dogs, so that all families may live in peace and harmony with their best friend, for life.


Our Breeding Mission Statement

To responsibly breed for the very best in temperament, health, and beauty, and to keep the same dog, in one home, for life.


Certified Pet Dog Trainers
Certified Regional Helper
Pet CPR & First Aid


Featured in 3 DVD’s and TV shows on National Geographic with Cesar Millan
Featured In Caesar Milan’s book: “How To Raise The Perfect Dog” Through Puppyhood and Beyond
Article published in latest book from APDT: ‘Top Tips from Top Trainers’
Articles published with Dog Training Magazines
Featured on ‘The Pet Place’

Work & Experience

Over 40 years in Dog Obedience Training, Specializing in Behavioral Problems & Aggressive Behavior
24 years responsibly breeding German Shepherds
19 years in German Conformation (showing and handling)
Mentor Trainers for ABC (Animal Behavioral College)
Regional Director – German Shepherd Dog Club of America – Working Dog Association
Expert witnesses on vicious dog attacks
Volunteer work with Animal Shelters/Rescues
Volunteer teaching TLC class for children under SPCA
Volunteer service dog trainers for special needs individuals

Associations & Memberships

BBB Accredited Business A+ Rating
APDT – (Association of Pet Dog Trainers)
IAABC – (International Association of Animal Behavioral Consultants)
GSDCA- (German Shepherd Dog Club of America)
GSDCA-WDA- (German Shepherd Dog Club of America-Working Dog)
AKC – (American Kennel Club)
SV – (Verein fur Deutsche Scheferhunde, Germany)
West Coast Schutzhund Club
Lake Matthews Schutzhund Club
South Corona Schutzhund Club (founders)